Tests

Various updates to 1.19 changelog #19499

Job	Run time
Test mypyc suite with 32-bit Python	9m 40s
Test suite with py311-ubuntu	9m 19s
Test suite with py310-ubuntu	12m 3s
Test suite with py39-ubuntu, mypyc-compiled	15m 45s
Type check our own code (py39-windows-64)	2m 31s
Type check our own code (py39-ubuntu)	1m 39s
Test suite with py312-ubuntu, mypyc-compiled	14m 24s
Test suite with py314-ubuntu, mypyc-compiled	14m 3s
Test suite with py313-ubuntu, mypyc-compiled	14m 8s
Test suite with py314-windows-64	26m 26s
mypyc runtime tests with py310-ubuntu	4m 50s
Formatting and code style with Black + ruff	1m 59s
mypyc runtime tests with py313-macos	6m 10s
	2h 12m 57s

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